> I have no idea what an electric purifier would even look like
Here are some of the popular brands that you can get over here:
https://www.eurekaforbes.com/water-purifiers/by-category/aqu...
These claim to use RO, UV etc. for purifying the water. I am kind of surprised that the Amazon USA listings for water purifiers return several fad-ish "gadget" things first, instead of the above.